M103 - Open Cluster in Cassiopeia
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M103 - Open Cluster in Cassiopeia
Edmonton, Alberta, Canada
2013-Dec-12
ISO200 4x4m, total 16m
EQMOD, BYEOS, DSS, CPT
NEQ6, E11, 0.7FR, 60Da, COAG, SSAG
M103 is an open star cluster in the constellation Cassiopeia.
The spikes on the brighter stares were induced by running two strings across the front of the telescope. Normally SCT telescopes like the EdgeHD 11 used for this photo do not cause diffraction spikes. The stars from an SCT are ideally perfectly round with no spikes at all.

But sometimes diffraction spikes can give a bit of sparkle to an image. For some people anyway. And for clusters, spikes can sometimes highlight the brighter stars. So to see how it would look, I ran a couple of strings across the front of the telescope.

This recreated the effect of the secondary mirror vanes that are usually found on Newtonians and RC styles of open front telescopes. Hubble for example, is an RC design and it induces spikes in the brighter stars. So, not saying it's a good thing. Scientifically, it probably isn't. But some might like it so it was worth a try.

Images of M103 - Open Cluster in Cassiopeia
M103 - Open Cluster in Cassiopeia. Imaged with an 11" EdgeHD SCT and a 60Da DSLR camera.
11" EdgeHD, DSLR
M103 - Open Cluster in Cassiopeia. Imaged with a CFF 132 refractor an an STF-8300M CCD camera.
CFF 132, RGB
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